# Page Not Found

The URL `files/UPEbZ8610RER9OfUgVBh` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [How to use Customer Note Updated Webhook](https://learn.doubletick.io/webhooks/how-to-use-customer-note-updated-webhook.md)
- [How to Appeal a Template Category Review](https://learn.doubletick.io/templates/how-to-appeal-a-template-category-review.md)
- [WhatsApp API Error: 131016 / 503 – Service Unavailable](https://learn.doubletick.io/troubleshoot-errors/whatsapp-api-error-131016-503-service-unavailable.md)
- [How to use Call Rejected Webhook](https://learn.doubletick.io/webhooks/how-to-use-call-rejected-webhook.md)
- [Unsupported Post Request Error in DoubleTick](https://learn.doubletick.io/troubleshoot-errors/unsupported-post-request-error-in-doubletick.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://learn.doubletick.io/webhooks/how-to-use-customer-note-updated-webhook.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://learn.doubletick.io/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://learn.doubletick.io/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/webhooks/how-to-use-customer-note-updated-webhook.md`).

You may also use `Accept: text/markdown` header for content negotiation.